Vegas shooter scouted locations in Boston, according to NBC

The Chicago hotel's proximity to the outdoor concert stadium suggested a similar scenario to the Las Vegas mass shooting, which killed 58 and injured nearly 500. He had about two dozen guns. He later booked a second room for August 3 through August 6, the same days as Lollapalooza in Grant Park.

Authorities have been trying to track Paddock's movements in the days and weeks before the deadliest mass shooting in modern USA history. On both occasions, he specifically requested a room with a view overlooking the park, and he had set a check-out date of August 6, the festival's final day. However officials said there's no evidence the suspected gunman ever came to Chicago that weekend. Hundreds of thousands of spectators attended, including Malia Obama, daughter of the ex-us president Barack Obama. But according to a new report, the terrorist might have been targeting another show.

Chicago police spokesman Anthony Guglielmi said that police are aware of the reports and they have been in communication with federal authorities.

At a news conference Tuesday afternoon, Las Vegas Sheriff Joe Lombardo said he could not confirm whether Paddock had eyed the Life is attractive concert prior to his attack on concertgoers. The dates corresponded with the "Life is Beautiful" music festival held from September 22-24.

According to some reports, the shooter had a similar view over the event crowd to the one he had in Las Vegas.

'Was he doing pre-surveillance?

"We already had a concert on City Hall Plaza", Evans said.

Senior law enforcement officials toldNBC News that Paddock, 64, had rented a room at a Chicago hotel, and also researched locations in Boston.

But investigators probing Sunday night's shooting are still confused by Paddock's motives. Lombardo told reporters that it was unclear if Paddock was conducting "presurveillance" of outdoor festivals or if the timing of the stay was coincidental.

Paddock's preparations included requesting an upper-floor room overlooking the festival, stockpiling 23 guns, a dozen of them modified to fire continuously like an automatic weapon, and setting up cameras inside and outside his room to watch for approaching officers. Police are still trying to determine whether he had any help or whether anyone knew about his plans.

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